Function waitForBusy

packages/opencode/test/session/prompt.test.ts:328–337

(sessionID: SessionID, duration: Duration.Input = "2 seconds")

// inside Runner.startShell's serialized transition, so cancel can't no-op once
// we observe it.
const waitForBusy = (sessionID: SessionID, duration: Duration.Input = "2 seconds") =>
  pollWithTimeout(
    Effect.gen(function* () {
      const status = yield* SessionStatus.Service
      const s = yield* status.get(sessionID)
      return s.type === "busy" ? (true as const) : undefined
    }),
    `session ${sessionID} never became busy`,
    duration,
  )

const hasBash = Effect.sync(() => Bun.which("bash") !== null)